Cationic biomacromolecular flocculant and preparation method thereof

A biomacromolecule and cationic technology, which is applied in the field of cationic biomacromolecule flocculant and its preparation, can solve the problems of low degree of cationic substitution, influence on purification efficiency, high viscosity of the system, etc., achieve good flocculation effect, save cost, The effect of high-efficiency modification

Inactive Publication Date: 2018-01-12
WUHAN UNIV OF TECH
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Problems solved by technology

There are also related reports on the application of konjac to water purification after modification, mainly through grafting or etherification to obtain konjac-based products with cationic groups in the molecular chain, but because of the low solubility of konjac in water and the high viscosity of the system, it is difficult to prepare , and the cation substitution degree of the obtained product is low, which affects the purification efficiency

Method used

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  • Cationic biomacromolecular flocculant and preparation method thereof
  • Cationic biomacromolecular flocculant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] To prepare cationic biomacromolecular flocculant, the specific steps are as follows:

[0024] 1) Preparation of ionic liquid: Put N-methylimidazole and allyl chloride in a molar ratio of 1:1.25 into a round-bottomed three-neck flask equipped with a reflux device and a thermometer, stir well at room temperature, and then slowly heat in a water bath to 55℃, the whole system is in N 2 Under protection, the reaction was completed after 8 hours to obtain a light yellow viscous liquid, which was extracted several times with anhydrous ether, and then dried in a vacuum oven at 80°C for 48 hours to obtain an ionic liquid (1-allyl-3-chloride Methimidazole);

[0025] 2) Preparation of konjac glucomannan: add konjac fine powder (150 mesh) into four times the weight of ethanol solution (50wt%), stir for 2 hours and filter with a G3 sand core funnel, filter residue and four times the weight of ethanol solution (80wt%) ) mixed and stirred for 2 hours and then filtered with a G3 sand...

Embodiment 2

[0028] The method for preparing cationic biomacromolecular flocculants is similar to that of Example 1, except that the molar ratio of konjac glucomannan to cationic etherifying agent is 1:4.

Embodiment 3

[0030] The method for preparing cationic biomacromolecular flocculants is similar to that of Example 1, except that the molar ratio of konjac glucomannan to cationic etherifying agent is 1:5.

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Abstract

The invention relates to a cationic biomacromolecular flocculant and a preparation method thereof. The preparation method comprises the following steps: with refined konjak powder as a raw material, removing impurities from the refined konjak powder by using ethanol to obtain konjac glucomannan, then dissolving the konjac glucomannan into ionic liquid, and carrying out an etherification reaction among the konjac glucomannan, a cationic etherifying agent and sodium hydroxide in the solution to obtain the cationic biomacromolecular flocculant, wherein the degree of cationic substitution is 0.16-0.45. According to the preparation method, the ionic liquid 1-allyl-3-methylimidazolium (AMIMCl) chloride prepared from N-methylimidazole and allyl chloride is used as a biomacromolecular solvent, a nucleophilic reagent sodium hydroxide is used as an initiator, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) is used as the etherifying agent, the KGM (konjac glucomannan) is modified on the basis of a mechanism that the etherification reaction is performed on hydroxyl groups on a molecular chain of biopolysaccharide, and the cationic biopolysaccharide flocculant is prepared, so that the application range of the KGM is widened and a good flocculating effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a cationic biomacromolecular flocculant and a preparation method thereof. Background technique [0002] With the continuous progress of the society and the rapid development of the economy, the environmental problems brought about by it are becoming more and more serious. Among them, water pollution brings the most problems, the greatest impact, and the most severe situation. It has become one of the problems that our country needs to solve urgently. Organic pollutants, inorganic pollutants, and suspended particulate impurities in industrial and domestic sewage are the main components. In order to achieve the purpose of water purification, the use of flocculants to treat sewage is an important treatment method. [0003] The main mechanism of flocculant is the electrostatic effect of anions and cations. The charged flocculant ions and the oppositely charged ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/02C02F1/56
Inventor 高山俊王凯刘俊威李思宇
Owner WUHAN UNIV OF TECH
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